[英]How to display user control within the main window in WPF using MVVM
我有一個WPF應用程序,只是開始學習MVVM模式。
我的目標是在我的應用程序的主窗口中有一個按鈕。 單擊此按鈕時,另一個窗口(或用戶控件)將出現在主窗口頂部。
這是MainWindow.xaml的代碼
<Window x:Class="SmartPole1080.View.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:utilities="clr-namespace:SoltaLabs.Avalon.Core.Utilities;assembly=SoltaLabs.Avalon.Core"
xmlns:userControls="clr-namespace:SoltaLabs.Avalon.View.Core.UserControls;assembly=SoltaLabs.Avalon.View.Core"
xmlns:controls="clr-namespace:WpfKb.Controls;assembly=SmartPole.WpfKb"
xmlns:wpf="clr-namespace:WebEye.Controls.Wpf;assembly=WebEye.Controls.Wpf.WebCameraControl"
xmlns:view="clr-namespace:SmartPole.View;assembly=SmartPole.View"
xmlns:view1="clr-namespace:SmartPole1080.View"
xmlns:behaviors="clr-namespace:SoltaLabs.Avalon.Core.Behaviors;assembly=SoltaLabs.Avalon.Core"
Title="Smart Pole"
WindowStartupLocation="CenterScreen"
Name="mainWindow"
behaviors:IdleBehavior.IsAutoReset="True" WindowState="Maximized" WindowStyle="None">
<Canvas Background="DarkGray">
<!--Main Grid-->
<Grid Width="1080" Height="1920" Background="White" Name="MainGrid"
HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<StackPanel Background="Black">
<Grid Background="#253341">
<Grid.RowDefinitions>
<RowDefinition Height="5"/>
<RowDefinition Height="*"/>
<RowDefinition Height="5"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="5"/>
<ColumnDefinition Width="264"/>
</Grid.ColumnDefinitions>
<Grid Grid.Row="1" Grid.Column="1">
<Button Tag="{StaticResource EmergencyImg}" Name="EmergencyButton"
Command="{Binding ShowEmergencyPanel}">
<Image Source="{StaticResource EmergencyImg}" />
</Button>
</Grid>
<!--Emergency Window Dialog-->
<Grid Name="EmergencyPanel">
<view1:EmergencyInfo x:Name="EmergencyInfoPanel"/>
</Grid>
</Grid>
</StackPanel>
</Grid>
<!--Main Grid-->
</Canvas>
這是另一個窗口(用戶控件-EmergencyInfo.xaml)
<UserControl x:Class="SmartPole1080.View.EmergencyInfo"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:SmartPole1080.View"
mc:Ignorable="d"
d:DesignHeight="1920" d:DesignWidth="1050"
x:Name="EmergencyInfoPanel">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="50"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Border Grid.Row="0" BorderBrush="White" Background="White">
<Button Background="White" BorderThickness="0" FontWeight="Bold" Foreground="Red"
HorizontalAlignment="Right" FontSize="25" Margin="0,0,15,0"
Command="{Binding HideEmergencyPanel}">
close X
</Button>
</Border>
<Image Grid.Row="1" Source="{StaticResource EdenParkInfoImg}" HorizontalAlignment="Left" />
</Grid>
我想使用MVVM模式實現此行為。 我在按鈕EmergencyButton中設置了綁定ShowEmergencyPanel
,以在單擊此按鈕時顯示EmergencyInfo。
任何幫助是極大的贊賞。
你為什么不做導航,像這樣。 為將要插入的圓錐形區域以及將要放置的任何類型的對象放在Windows中。在DataTemplate中將其放置在資源中。
在主要的windo xaml
<Window.DataContext>
<local:MainWindowViewModel />
</Window.DataContext>
<Window.Resources>
<DataTemplate DataType="{x:Type home:HomeViewModel}">
<home:HomeView />
</DataTemplate>
<DataTemplate DataType="{x:Type other:OtherViewModel}">
<other:OtherView />
</DataTemplate>
</Window.Resources>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="auto" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Grid x:Name="Navigation">
<StackPanel Orientation="Horizontal">
<Button x:Name="HomeView"
Content="Home"
Margin="5"
Command="{Binding NavigationCommand}"
CommandParameter="home" />
<Button x:Name="Menu"
Content="OtherView"
Margin="5"
Command="{Binding NavigationCommand}"
CommandParameter="Other" />
</StackPanel>
</Grid>
<Grid x:Name="MainContent"
Grid.Row="1">
<ContentControl Content="{Binding CurrentViewModel}" />
</Grid>
</Grid>
MainWindowViewModel可以看起來像這樣。
public class MainWindowViewModel : INotifyPropertyChanged
{
private OtherViewModel otherVM;
private HomeViewModel homeVM;
public DelegateCommand<string> NavigationCommand { get; private set; }
public MainWindowViewModel()
{
otherVM = new OtherViewModel();
homeVM = new HomeViewModel();
// Setting default: homeViewModela.
CurrentViewModel = homeVM;
NavigationCommand = new DelegateCommand<string>(OnNavigate);
}
private void OnNavigate(string navPath)
{
switch (navPath)
{
case "other":
CurrentViewModel = otherVM;
break;
case "home":
CurrentViewModel = homeVM;
break;
}
}
private object _currentViewModel;
public object CurrentViewModel
{
get { return _currentViewModel; }
set
{
if (_currentViewModel != value)
{
_currentViewModel = value;
OnPropertyChanged();
}
}
}
#region INotifyPropertyChanged
public event PropertyChangedEventHandler PropertyChanged = delegate { };
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
PropertyChanged(this, new propertyChangedEventArgs(propertyName));
}
#endregion
}
在可以使用DelegateCommand的地方,請檢查如何制作RelayCommand(和通用的)或使用具有自己的DelegateCommand的PRISM。 但是,如果您想使用PRISM,它已經可以導航到區域,可以解決許多問題。 查看來自Brian Lagunas的視頻。
編輯:這是顯示/隱藏網格。 在您設置mainInfo的mainWindow中,您可以以這種方式顯示/隱藏該網格。
在您的MainViewViewModel中,創建一個bool屬性IsVisible
private bool _isVisible;
public bool IsVisible
{
get { return _isVisible; }
set
{
_isVisible = value;
OnPropertyChanged();
}
}
在您的MainView.Resources中將鍵設置為BooleanToVisibilityConverter,例如:
<BooleanToVisibilityConverter x:Key="Show"/>
以及您要顯示/隱藏的網格可見性:
<Grid x:Name="SomeGridName"
Grid.Row="1"
Grid.Colum="1"
Visibility="{Binding IsVisible,Converter={StaticResource Show}}">
最后將IsVisible屬性設置為某些ToggleButton,僅在true / false之間切換
<ToggleButton IsChecked="{Binding IsVisible}"
Content="ShowGrid" />
這樣,您可以基於IsVisible顯示/隱藏該網格零件,並控制onClick的可見性。 希望能有所幫助。
在您的Window xaml中:
<ContentPresenter Content="{Binding Control}"></ContentPresenter>
這樣,您的ViewModel必須包含Control屬性。
將您的ViewModel添加到Window的DataContext中。 (例如,在窗口構造函數中, this.Datacontext = new ViewModel();
)
或使用接口的另一種方式:
public interface IWindowView
{
IUserControlKeeper ViewModel { get; set; }
}
public interface IUserControlKeeper
{
UserControl Control { get; set; }
}
public partial class YourWindow : IViewWindow
{
public YourWindow()
{
InitializeComponent();
}
public IUserControlKeeper ViewModel
{
get
{
return (IUserControlKeeper)DataContext;
}
set
{
DataContext = value;
}
}
}
(以這種方式,在要使用的窗口中初始化您的窗口。服務?)
private IViewWindow _window;
private IViewWindow Window //or public...
{
get{
if(_window==null)
{
_window = new YourWindow();
_window.ViewModel = new YourViewModel();
}
return _window;
}
}
使用您的一個UserControls打開窗口:
void ShowWindowWithControl(object ControlView, INotifyPropertyChanged ControlViewModel, bool ShowAsDialog)
{
if(ControlView is UserControl)
{ //with interface: Window.ViewModel.Control = ...
(Window.DataContext as YourViewModel).Control = (UserControl)ControlView;
if (ControlViewModel != null)
(Window.DataContext as YourViewModel).Control.DataContext = ControlViewModel;
if (ShowAsDialog) //with interface use cast to call the show...
Window.ShowDialog();
else
Window.Show();
}
}
您可以做的是,將“緊急情況”用戶控件放在MainGrid內,並通過Model屬性控制其可見性。
<Canvas Background="DarkGray">
<!--Main Grid-->
<Grid Width="1080" Height="1920" Background="White" Name="MainGrid"
HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<StackPanel Background="Black">
<Grid Background="#253341">
<Grid.RowDefinitions>
<RowDefinition Height="5"/>
<RowDefinition Height="*"/>
<RowDefinition Height="5"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="5"/>
<ColumnDefinition Width="264"/>
</Grid.ColumnDefinitions>
<Grid Grid.Row="1" Grid.Column="1">
<Button Tag="{StaticResource EmergencyImg}" Name="EmergencyButton"
Command="{Binding ShowEmergencyPanel}">
<Image Source="{StaticResource EmergencyImg}" />
</Button>
</Grid>
</Grid>
</StackPanel>
<Grid Name="EmergencyPanel">
<view1:EmergencyInfo x:Name="EmergencyInfoPanel" Visibility={Binding IsEmergencyPanelVisible,Converter={StaticResource BoolToVisibilityConverter}} DataContext={Binding} />
</Grid>
</Grid>
<!--Main Grid-->
</Canvas>
通過為持有用戶控件的Grid設置適當的背景,可以實現模態窗口般的效果。 並且您需要讓IsEmergencyPanelVisible(默認值為false)作為您的模型,並且應該在按鈕單擊命令上將此屬性更改為true。
注意:我猜您對轉換器很熟悉,所以我在解決方案中包含了轉換器。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.